Top Definition
This regional favorite consists of three parts. It requires a person to defecate on another person's face (preferably a hard stool). The person then urinates on the feces and face. The last step necessary to complete this fetish favorite is key. This is where the name of the move is derived. The person then sits on the other person's face subsequently "mashing" the urine and feces into them.
Sorry, toilet is broken. Ever heard of the Montebello Masher?
by Autistic Pornstar February 05, 2010

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